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                <h2 id="transient-关键字"><a href="#transient-关键字" class="headerlink" title="transient 关键字"></a>transient 关键字</h2><p>然而在实际开发过程中，我们常常会遇到这样的问题，这个类的有些属性需要序列化，而其他属性不需要被序列化，打个比方，如果一个用户有一些敏感信息（如密码，银行卡号等），为了安全起见，不希望在网络操作（主要涉及到序列化操作，本地序列化缓存也适用）中被传输，这些信息对应的变量就可以加上transient关键字。换句话说，这个字段的生命周期仅存于调用者的内存中而不会写到磁盘里持久化。</p>
<p>总之，java 的transient关键字为我们提供了便利，你只需要实现Serilizable接口，将不需要序列化的属性前添加关键字transient，序列化对象的时候，这个属性就不会序列化到指定的目的地中。</p>
<h2 id="SuperBuilder"><a href="#SuperBuilder" class="headerlink" title="@SuperBuilder"></a>@SuperBuilder</h2><p><code>@Builder并不支持父类成员属性的构造</code>，<code>@SuperBuilder注解的出现，就是用来解决这个问题</code>。</p>
<p>@SuperBuilder(toBuilder = true)用法,toBuilder属性默认关闭,通过<code>设置true</code>，<code>所有的类实例会拥有toBuilder方法</code>这是一个类似<code>深拷贝</code>的一个方法，<code>不会改变原有实例的属性</code>，<code>生成一个新的实例</code>。在<code>toBuilder中有赋值的属性</code>则会<code>改变为赋值属性</code>，<code>没有赋值的以调用的实例中的值为准</code>。</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">A 类 要加@SuperBuilder(toBuilder&#x3D; true)
父类B 同时也要加 @SuperBuilder(toBuilder&#x3D; true)<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>

<p>使用<code>@Builder或@SuperBuilder注解</code>时，<code>不会默认创建空参构造函数</code>，如果你有额外使用空参构造函数或全参构造函数的需求，需要在子类和父类都加上以下注解：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">@AllArgsConstructor &#x2F;&#x2F;全参构造函数
@NoArgsConstructor &#x2F;&#x2F;空参构造函数<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>



<h2 id="anyMatch"><a href="#anyMatch" class="headerlink" title="anyMatch()"></a>anyMatch()</h2><p>boolean anyMatch(Predicate&lt;? super T&gt; predicate),很容易理解，即是有一个或一个以上的元素满足函数参数计算结果为true那整个方法返回值为true。</p>
<h2 id="allMatch"><a href="#allMatch" class="headerlink" title="allMatch()"></a>allMatch()</h2><p>字面意思就是全部匹配。作用就是定义一个函数参数对<a target="_blank" rel="noopener" href="https://so.csdn.net/so/search?q=%E9%9B%86%E5%90%88&spm=1001.2101.3001.7020">集合</a>中全部元素进行计算，如果返回结果都是true那最终结果为true（还有一种情况就是集合元素为空也返回true），如果有一个或多个元素计算结果为false那最终结果为false。这个方法是一个短路的中间操作，既然是短路操作，那就不需要执行完流中全部元素。</p>
<h2 id="BigDecimal-setScale"><a href="#BigDecimal-setScale" class="headerlink" title="BigDecimal.setScale()"></a>BigDecimal.setScale()</h2><p>BigDecimal.setScale()方法用于格式化小数点<br>setScale(1)表示保留一位小数，默认用四舍五入方式<br>setScale(1,BigDecimal.ROUND_DOWN)直接删除多余的小数位，如2.35会变成2.3<br>setScale(1,BigDecimal.ROUND_UP)进位处理，2.35变成2.4<br>setScale(1,BigDecimal.ROUND_HALF_UP)四舍五入，2.35变成2.4setScaler(1,BigDecimal.ROUND_HALF_DOWN)四舍五入，2.35变成2.3，如果是5则向下舍</p>
<h2 id="BigInteger-multiply-BigInteger-val"><a href="#BigInteger-multiply-BigInteger-val" class="headerlink" title="BigInteger.multiply(BigInteger val)"></a>BigInteger.multiply(BigInteger val)</h2><p>返回一个<a target="_blank" rel="noopener" href="https://so.csdn.net/so/search?q=BigInteger&spm=1001.2101.3001.7020">BigInteger</a>，其值是 (this * val).</p>
<h2 id="sessionFactory-getCurrentSession"><a href="#sessionFactory-getCurrentSession" class="headerlink" title="sessionFactory.getCurrentSession()"></a>sessionFactory.getCurrentSession()</h2><p>SessionFactory.getCurrentSession()可以完成一系列的工作，当调用时，hibernate将session绑定到当前线程，事务结束后，hibernate将session从当前线程中释放，并且关闭session。当再次调用getCurrentSession()时，将得到一个新的session，并重新开始这一系列工作。</p>
<p>开启一个会话，类似于php。</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">Session session &#x3D; HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
Event theEvent &#x3D; new Event();
theEvent.setTitle(title);
theEvent.setDate(theDate);
session.save(theEvent);
session.getTransaction().commit();<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<h2 id="Session-load-get"><a href="#Session-load-get" class="headerlink" title="Session.load/get"></a>Session.load/get</h2><p><a target="_blank" rel="noopener" href="https://so.csdn.net/so/search?q=Session&spm=1001.2101.3001.7020">Session</a>.load/get方法均可以根据指定的实体类和id从数据库读取记录，并返回与之对应的实体对象。</p>
<p>load方法可以充分利用内部缓存和<a target="_blank" rel="noopener" href="https://so.csdn.net/so/search?q=%E4%BA%8C%E7%BA%A7%E7%BC%93%E5%AD%98&spm=1001.2101.3001.7020">二级缓存</a>中的现有数据，而get方法则仅仅在内部缓存中进行数据查找，如没有发现对应数据，将越过二级缓存，直接调用SQL完成数据读取。</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">&#x2F;** *&#x2F;&#x2F;**
  * load()方法的执行顺序如下：
  * a)：首先通过id在session缓存中查找对象，如果存在此id的对象，直接将其返回
  * b)：在二级缓存中查找，找到后将 其返回。
  * c)：如果在session缓存和二级缓存中都找不到此对象，则从数据库中加载有此ID的对象
  * 因此load()方法并不总是导致SQL语句，只有缓存中无此数据时，才向数据库发送SQL！  
  *&#x2F;

 &#x2F;** *&#x2F;&#x2F;**
  * 与get()的区别：
  * 1：在立即加载对象（当hibernate在从数据库中取得数据组装好一个对象后
  * 会立即再从数据库取得数据此对象所关联的对象）时，如果对象存在，
  * load()和get()方法没有区别，都可以取得已初始化的对象;但如果当对
  * 象不存在且是立即加载时，使用get()方法则返回null,而使用load()则
  * 抛出一个异常。因此使用load()方法时，要确认查询的主键ID一定是存在
  * 的，从这一点讲它没有get方便！
  * 2：在延迟加载对象(Hibernate从数据库中取得数据组装好一个对象后，
  * 不会立即再从数据库取得数据组装此对象所关联的对象，而是等到需要时，
  * 都会从数据库取得数据组装此对象关联的对象)时，get()方法仍然使用
  * 立即加载的方式发送SQL语句，并得到已初始化的对象，而load()方法则
  * 根本不发送SQL语句，它返回一个代理对象，直到这个对象被访问时才被
  * 初始化。
  *&#x2F;
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="of方法"><a href="#of方法" class="headerlink" title="of方法"></a>of方法</h2><p>在开发中of方法一般都是对格式进行规格化或者进行处理。</p>
<h2 id="Stream-of-filter-collect-Collectors-joining"><a href="#Stream-of-filter-collect-Collectors-joining" class="headerlink" title="Stream.of().filter().collect(Collectors.joining)"></a>Stream.of().filter().collect(Collectors.joining)</h2><pre class="line-numbers language-java" data-language="java"><code class="language-java">&#x2F;&#x2F;stream.of将目标转换成一个stream流、然后使用filter对其隔离、使用collect收集前一个操作剩下的流，然后使用collectors对收集到的进行操作。<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>



<h2 id="functionalinterface"><a href="#functionalinterface" class="headerlink" title="@functionalinterface"></a>@functionalinterface</h2><p>表明这是一个函数式接口，那么其中肯定含有一个抽象方法需要继承。</p>
<h2 id="Optional"><a href="#Optional" class="headerlink" title="Optional"></a>Optional</h2><p>Optional类是一个可以为nul的容器对象。如果值存在则isPresent()方法会返回true,调用get()方 法会返回该对象。</p>
<h2 id="invoke"><a href="#invoke" class="headerlink" title="invoke"></a>invoke</h2><p>拦截进行调用，<code>ProceedingJoinPoint</code>代表当前点，使用</p>
<h2 id="Objects-requireNonNull"><a href="#Objects-requireNonNull" class="headerlink" title="Objects.requireNonNull( )"></a>Objects.requireNonNull( )</h2><pre class="line-numbers language-java" data-language="java"><code class="language-java"> &#x2F;* @param obj 需要检测是否为空的对象
 * @param &lt;T&gt; 对象类型
 * @return 对象不为空则返回该对象
 * @throws 对象为空则报NullPointerException异常
 *&#x2F;
public static &lt;T&gt; T requireNonNull(T obj) &#123;
    if (obj &#x3D;&#x3D; null)
        throw new NullPointerException();
    return obj;
&#125;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>





<h2 id="Enumeration"><a href="#Enumeration" class="headerlink" title="Enumeration"></a>Enumeration</h2><p>Enumeration接口中定义了一些方法，通过这些方法可以枚举（一次获得一个）对象集合中的元素。</p>
<p><strong>boolean hasMoreElements( )</strong><br> 测试此枚举是否包含更多的元素。</p>
<h1 id="StopWatch"><a href="#StopWatch" class="headerlink" title="StopWatch"></a>StopWatch</h1><p>java常用的计时器，StopWatch stopWatch = StopWatch.createStarted();开启时间记录。</p>
<p>stopWatch.stop();计时结束。</p>
<h2 id="Cacheable和-CacheEvict"><a href="#Cacheable和-CacheEvict" class="headerlink" title="@Cacheable和@CacheEvict"></a>@Cacheable和@CacheEvict</h2><pre class="line-numbers language-java" data-language="java"><code class="language-java">@Cacheable(value &#x3D; &quot;MessageQueueConfigurePO&quot;, unless &#x3D; &quot;#result&#x3D;&#x3D;null || #result.isEmpty()&quot;)
&#x2F;&#x2F;用来缓存MessageQueueConfigurePO 的xml文件中的内容，不要缓存结果为null或者为空的<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>

<ul>
<li><p><code>cacheNames/value</code> ：用来指定缓存组件的名字</p>
</li>
<li><p><code>unless</code> ：否定缓存。当 unless 指定的条件为 true ，方法的返回值就不会被缓存。当然你也可以获取到结果进行判断。（通过 <code>#result</code> 获取方法结果）</p>
</li>
</ul>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">@CacheEvict(value &#x3D; &quot;MessageQueueConfigurePO&quot;,key &#x3D; &quot;#tenantId.toString()&quot;)
&#x2F;&#x2F;用来清除这个xml上面的缓存，清除key为tenantId.toString()的数据。<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>



<h2 id="Hibernate查询"><a href="#Hibernate查询" class="headerlink" title="Hibernate查询"></a>Hibernate查询</h2><pre class="line-numbers language-java" data-language="java"><code class="language-java">CriteriaBuilder cb &#x3D; session.getCriteriaBuilder();
CriteriaQuery&lt;OrderPO&gt; query &#x3D; cb.createQuery(OrderPO.class);
Root&lt;OrderPO&gt; root &#x3D; query.from(OrderPO.class);
this.appendWhere(query, cb, root);
List&lt;OrderPO&gt; orderPOS &#x3D; session.createQuery(query).getResultList();<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>





<h2 id="toLowerCase"><a href="#toLowerCase" class="headerlink" title="toLowerCase()"></a>toLowerCase()</h2><p>转换成小写</p>
<h2 id="extends-JsonSerializer"><a href="#extends-JsonSerializer" class="headerlink" title="extends JsonSerializer"></a>extends JsonSerializer<BigDecimal></h2><p>常用一些序列化操作，用来对json数据进行序列化，需要继承然后实现。</p>
<h2 id="SneakyThrows"><a href="#SneakyThrows" class="headerlink" title="@SneakyThrows"></a>@SneakyThrows</h2><p>普通Exception类,也就是我们常说的受检异常或者Checked Exception会强制要求抛出它的方法声明throws，调用者必须显示的去处理这个异常。设计的目的是为了提醒开发者处理一些场景中必然可能存在的异常情况。比如网络异常造成IOException。</p>
<p>但是现实大部分情况下的异常，我们都是一路往外抛了事。所以渐渐的java程序员处理Exception的常见手段就是外面包一层RuntimeException，接着往上丢</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">try&#123;
&#125;catch(Exception e)&#123;
throw new RuntimeException(e);
&#125;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<p>而Lombok的@SneakyThrows就是为了消除这样的模板代码。<br>使用注解后不需要担心Exception的处理。</p>
<h2 id="EventListener注解"><a href="#EventListener注解" class="headerlink" title="@EventListener注解"></a>@EventListener注解</h2><pre class="line-numbers language-java" data-language="java"><code class="language-java">@Configuration
public class ListenerConfig &#123;

    &#x2F;&#x2F; 如果不写classes,则会监听到 ContextRefreshedEvent、ServletWebServerInitializedEvent、ApplicationStartedEvent、ApplicationReadyEvent
    &#x2F;&#x2F; 如下写了classes后，则只会监听到ApplicationStartedEvent事件了,后面的condition是可以使用SpEL表达式作为过滤条件的
    @EventListener&#x2F;*(classes &#x3D; &#123;ApplicationStartedEvent.class&#125;,condition &#x3D; &quot;#root.event.timestamp&gt;0&quot;)*&#x2F;
    public ApplicationEvent handApplicationEvent(ApplicationStartedEvent event) &#123;
        System.out.println(&quot;处理事件...&quot; + event);
        return new PayloadApplicationEvent(new Object(),new Object()); &#x2F;&#x2F; 返回值若不为null，则会继续发布该事件
    &#125;
    
    @EventListener&#x2F;*(classes &#x3D; &#123;ApplicationStartedEvent.class&#125;,condition &#x3D; &quot;#root.event.timestamp&gt;0&quot;)*&#x2F;
    public void handPayloadApplicationEvent(PayloadApplicationEvent event) &#123;
        System.out.println(&quot;处理事件...2&quot; + event);
    &#125;

&#125;<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>



<h2 id="Builder-toBuilder-true"><a href="#Builder-toBuilder-true" class="headerlink" title="@Builder(toBuilder = true)"></a>@Builder(toBuilder = true)</h2><p>默认@builder为false和@builder增加了一个新功能，就是可以进行属性的修改。</p>
<p>属性初始化<br>UserInfoBO jerry = UserInfoBO.builder().id(“123”).userNm(“jerry”).password(“666”).build();<br>1<br>属性修改<br>UserInfoBO tom = jerry.toBuilder().userNm(“tom”).password(“888”).build();</p>
<h2 id="isAssignableFrom（）"><a href="#isAssignableFrom（）" class="headerlink" title=".isAssignableFrom（）"></a>.isAssignableFrom（）</h2><p>常常用来判断两个类是不是属于同一个继承树的关系，如果是就返回true。类似于instanceof，只不过这是通过类信息进行判断信息。</p>
<p>isAssignableFrom()方法与<a target="_blank" rel="noopener" href="https://so.csdn.net/so/search?q=instanceof&spm=1001.2101.3001.7020">instanceof</a>关键字的区别总结为以下两个点：</p>
<ul>
<li>isAssignableFrom()方法是从类继承的角度去判断，instanceof关键字是从实例继承的角度去判断。</li>
<li>isAssignableFrom()方法是判断是否为某个类的父类，instanceof关键字是判断是否某个类的子类</li>
</ul>

                
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